<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>微任务与宏任务</title>
  </head>

  <body>
    <script>
      /**
       * 目标：阅读并回答打印的执行顺序
       */
      console.log(1);
      setTimeout(() => {
        console.log(2);
      }, 0);
      const p = new Promise((resolve, reject) => {
        console.log(7);
        resolve(3);
      });
      p.then((res) => {
        console.log(res);
      });
      console.log(4);

      // 打印结果  1  7  4 3  2
    </script>
  </body>
</html>
